EP0530797B1 - Dispositif pour le dosage de matériaux en vrac - Google Patents

Dispositif pour le dosage de matériaux en vrac Download PDF

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Publication number
EP0530797B1
EP0530797B1 EP92115069A EP92115069A EP0530797B1 EP 0530797 B1 EP0530797 B1 EP 0530797B1 EP 92115069 A EP92115069 A EP 92115069A EP 92115069 A EP92115069 A EP 92115069A EP 0530797 B1 EP0530797 B1 EP 0530797B1
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EP
European Patent Office
Prior art keywords
measuring
section
mass
sections
station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92115069A
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German (de)
English (en)
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EP0530797A1 (fr
Inventor
Hans Wilhelm Häfner
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Pfister GmbH
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Pfister GmbH
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Publication of EP0530797A1 publication Critical patent/EP0530797A1/fr
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Publication of EP0530797B1 publication Critical patent/EP0530797B1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
    • G01G11/08—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having means for controlling the rate of feed or discharge
    • G01G11/083—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having means for controlling the rate of feed or discharge of the weight-belt or weigh-auger type

Definitions

  • the invention relates to a gravimetric metering device for bulk goods according to the preamble of claim 1.
  • a device for continuous gravimetric dosing of pourable material which is directed via a feed opening in pockets of a rotor arranged in a housing and rotatable about a vertical axis and with supply of compressed air via a feed opening to Direction of rotation of the rotor offset discharge opening is removed.
  • the housing is pivotally mounted about a substantially horizontal axis and connected to a force measuring device arranged at a distance from this axis, and an elastic connecting member is provided at each of the feed opening and the emptying opening.
  • the horizontal axis runs through the centers of the elastic connecting members, so that forces which could occur due to twisting when loading the metering device are ineffective.
  • a relatively high accuracy can be achieved with such a metering device, but it is relatively complex.
  • bridges can form in the pockets of the rotor, which under unfavorable conditions can lead to inadequate discharge of the bulk goods and thus to falsifications of the measured values.
  • the invention has for its object to provide a gravimetric metering device with a simple structure and high measuring accuracy.
  • the design of the rotor as a measuring plate makes it significantly easier to manufacture with excellent measuring accuracy.
  • the measuring accuracy can be increased in that, according to a preferred development, a tare determination is also carried out.
  • FIG. 1 and 2 show a first embodiment of a sector metering device 10 according to the invention with a measuring plate 19, which in the embodiment is divided into four sectors 18, which rests on a rotary plate 16 via force measuring devices to be described in detail, hereinafter called load cells 20 for short a motor 12, optionally driven by a gear 14 and an axis 15, with adjustable or regulated speed.
  • the device 10 rests on a base 13, which can be a frame or the like.
  • a shaft 25 opens, which is supplied with flowable material 22 from a container 24 which is also arranged in a stationary manner. In this way, the loading station B is formed.
  • the shaft 25 diametrically opposite is an emptying station E in the form of a straight or preferably curved scraper 26 which removes the material 22 applied to the measuring plate 19 from the measuring plate 19 so that the measuring plate is emptied before it is again under the shaft 25 arrives.
  • the measuring plate 19 in the exemplary embodiment consists of four identical sectors 18 which independently of one another, for example separated by radial slots 28 which are flexibly bridged in a manner to be described later, load cells 20 are respectively placed on them, so that each sector 18 can be regarded as a kind of independent platform scale.
  • a sector 18 passes under the shaft 25, so that it is loaded with goods 22.
  • the material 22 can be made uniform in height by means of a stationary, radially arranged doctor blade 27 and can be limited to the outside.
  • the sector 18 just loaded was brought into the measuring position labeled M, in which it is unaffected by the further loading of the measuring plate 19, namely the next sector 18 (and also by the subsequent throwing off of the good 22 from the previous sector).
  • the load cell (s) 20 located below the sector 18 is (are) briefly activated and the mass of the goods 22 located on the sector 18 is determined. It should be noted that in practice a static mass determination is carried out since the sector 18 is supported on the turntable 16 via the load cell (s) 20.
  • the sector 18 In the third phase of the mass determination process, the sector 18, after a further rotation by 90 °, reaches the discharge area forming the emptying station E (FIG. 2, right), into which the material 22 is dropped by the scraper 26 from the measuring plate 19. It should be noted, as mentioned briefly above, that the dropping of the material 22 from the sector 18 located in the dropping area has no influence on the mass determination for the subsequent sector 18 now located in the measuring area M.
  • the emptied sector 18 finally arrives in the area T (FIG. 2, top), in which the load cells 20 located below it preferably can be activated again to determine the empty weight (tare) of the sector 18 located there, which then runs back into the area of the shaft 25 for further loading.
  • the respective angular position of the measuring plate 19 is continuously determined by any known means, for example by four magnets 21 arranged circumferentially distributed around 90 ° on the underside of the rotating plate 16, which pass an induction coil 23. This makes it possible to determine the point in time at which the measuring plate 19 is in the position shown in FIG. 2 (and any further position rotated by 90 °). At this point in time, the value recorded by the load cells 20 in the measuring range M and in the tare range T is determined and the actual mass conveyed by a sector 18 is determined by forming the difference between the assigned values.
  • a certain mass is to be conveyed in discontinuous metering, this is obtained by accumulation or addition of the specific mass values.
  • the determined ones are Measured values for the individual sectors are related to the time or the speed of the measuring plate 19.
  • a control signal for the motor 12 can then be derived therefrom in order to maintain a target value for the throughput.
  • the calculation can be simplified by continuously forming an average for the tare or empty weight at T and subtracting this average from the respective measurements in the M range or multiplied accordingly from the total mass.
  • 3 to 5 illustrate further developments which can preferably be used in connection with the device according to the invention according to FIG. 1.
  • FIG. 3 shows a closed system in which the sector metering device 10 is accommodated in a closed housing 40 which, for example, simultaneously forms a funnel 42 via which the material 22 thrown off by the device 10 reaches a narrowed chamber 43 which can be conveyed pneumatically via an outlet line 46 by means of compressed air supplied via a nozzle 44.
  • FIG. 4 illustrates further modifications and developments of the sector metering device 10 according to the invention, which relate to the loading of the device on the one hand and the removal of the metered material on the other hand.
  • the shaft 15 has an upper extension 51 for driving a cellular wheel 55 of a cellular wheel sluice 54, with chambers 56 of the cellular wheel 55 being filled from the container 24 via an upper opening 57 in the housing of the cellular wheel sluice 54 and, after rotation through a desired angular range, through an emptying opening 58 be emptied on the underside of the housing onto the measuring plate 19 of the device 10.
  • a stirrer 52 can be attached to the upper end of the extension 51 of the shaft 15, the rotation of which prevents dome formation in the container 24 and equalizes the supply of material to the cellular wheel sluice 54 and from this onto the measuring plate 19.
  • a cellular wheel sluice 60 is again provided in the device according to FIG. 4, in which metered material 22 passes from the funnel 42 via an upper opening 64 into the cellular wheel chambers 62 and from there via a Outlet opening 65 on the underside drops out unless it is blown into a pneumatic discharge line 68 by compressed air applied via a pressure line 66.
  • FIG. 5 shows another preferred development of the sector metering device 10 according to the invention, in which a feed turntable 72 is driven via a shaft stub 73 of the shaft 15 in order to equalize the supply of material 22 to the measuring plate 19.
  • the rotating plate 72 thus rotating above the measuring plate 19 is in turn fed from the container 24 via a shaft 74, so that here, too, an equalization of the supply of material to the measuring plate 19 is achieved.
  • FIG. 6 shows a conventional lever arrangement 76 which acts on a load cell 75.
  • FIG. 7 shows a force measuring arrangement with a parallel link system 78 and a shear force meter 77, while in FIG. 8 the bearing of the sector 18 on two (or three or more) force measuring cells 79 is illustrated.
  • a single elastomeric load cell 82 is used to support the sector 18, which is particularly insensitive to lateral forces (see, for example, EP-B1-0 205 509).
  • 11 to 13, 15 and 16 illustrate an alternative embodiment in which the load cells 20 are arranged stationary and only the measuring plate 19 rotates.
  • 11 to 13 show a sector metering device 80 in which only the measuring plate 19 rotates and the load cells 86 are arranged in a stationary manner.
  • the individual sectors 18 via z. B. parallel link 84 attached to the shaft 15, with one of the handlebars picked up in the horizontal plane, so that each sector 18 is held in a known manner in a horizontal orientation, but is freely movable in the vertical direction.
  • each sector is 18 in a bracket 87 mounted a roller 88 with circumferential alignment, which run on a circular rail which is interrupted in the measuring ranges M and T by rail segments 89, which are supported on any force measuring device, such as a shear force sensor 86, which is stationary, for example on a Frame 90 is arranged.
  • any force measuring device such as a shear force sensor 86, which is stationary, for example on a Frame 90 is arranged.
  • the rail is supported on the frame 90 in a stationary manner.
  • the rail segments 89 are preferably shorter than a sector 18.
  • roller 88 can also be attached to the force measuring device 86 according to FIG. 13, rail segment segments 91 corresponding to the sector length then being arranged opposite one another on the underside of the sectors 18.
  • the individual sectors 18 are thus loaded one after the other through the measuring ranges M and T, the force measuring devices 86 arranged there according to the mass of the sector 18 and the goods conveyed thereon, whereby, as in the first exemplary embodiment, only in the T range the mass of the emptied sector 18 is determined.
  • rollers or rails are attached approximately centrally on the underside of the sectors 18.
  • a support can also take place in the vicinity of the outer edge if, for example, the sector 18 is supported near its inner edge via a hinge point 92 on a plate 95 fastened on the shaft 15 .
  • an articulated support according to FIG. 14 can also be used in connection with the first embodiment, each sector 18 being supported on a load cell 20 which is placed near the outer edge of the turntable 16.
  • the rail 89 can also be omitted, so that the rollers 88 roll directly on the underside of the sectors 18.
  • 17 to 19 show a third basic embodiment of the sector metering device 120, in which a rubber cover 100 or a correspondingly thin steel sheet is applied to the top of the measuring plate 19 and extends across all sectors 18.
  • the inner edge of the mat or sheet 100 is clamped in a block 102 which is attached to the circumference of the shaft 15. This results in an extremely simple radial fixation of the sectors 18 without significantly affecting the vertical mobility.
  • the sectors 18 can then be placed on the force measuring device 20 without special measures, for example on one or more measuring cells distributed over the sectors 18. 17 shows different possibilities of such arrangements in the individual sectors, the same arrangements being expediently chosen for all sectors.
  • the turntable 16 can have a raised outer edge 104 and the mat or sheet 100 can extend over this edge and be fastened to its upper edge.
  • the measuring plate 19 consists of a steel plate 109, which is reduced in thickness at the transition points between the individual sectors 18 in such a way that only thin, flexible webs 110 remain.
  • the measuring cells used in the context of the invention have extremely short measuring paths, so that the webs 110 practically do not influence the measurement.
  • FIG. 20 shows two further preferred modifications of the device according to the invention.
  • the sector 18 passing through at the emptying station can also be suctioned off. Compressed air is passed through a nozzle 144 into a suction space 143 and the material sucked in is drawn off via a discharge line 146, which leads to a practically complete emptying of the sector, so that the tare measurement could possibly be omitted.
  • the individual sectors 18 could be provided with a peripheral segment wall. The radial transitions between the sectors could also be increased with overlaps 101.
  • the Suction device could also be used in addition to the scraper 26 behind this.
  • FIG. 20 shows a simplified possibility of mechanical difference formation via a double linkage linkage 176, the respective mass in sector T acting on the linkage 176 from that in sector M at opposite points and the difference (i.e. net) being determined by the load cell 20 becomes.
  • the mechanical structure of the metering device according to the invention is only indicated schematically, with the rotary plate 16 being modified by a motor 212 via a gear 214 via a shaft 215 extending upwards, in a modification of the first exemplary embodiment is driven.
  • the four sectors 18 are each supported on the turntable 16 via a load cell 201, 202, 203 and 204.
  • the load cells 20 (FIG. 1) or 201 to 204 (FIG. 23) rotate with the turntable 16
  • the signal is picked up from the load cells in a manner which is generally known to the person skilled in the art, inductively or via a slip ring sectors / brush combination (not shown) the shaft 215 is attached.
  • the load cells 20 are arranged stationary, so that a direct line connection is possible.
  • the timing is achieved once by means of a clock disk 218 fastened on the shaft 215, which is provided with a tooth, when passing a sensor 220 per revolution 240 (FIG. 24), a pulse 241 ( 24) is generated, which is fed to a timing circuit 222.
  • the timing circuit 222 applies pulses 251 to 254 to the selection circuit 228, which serve to switch through the output signals of the load cells 201 to 204 at a time when the respective sector 18 is at the measuring station M ( see also Fig. 2).
  • the selection pulses 251 to 254 analog pulses 263, 264, 261, 262 activate in succession, with an offset of 90 °, that of the load cells 201 to 204, which is located at the tare station T.
  • the tare value measured at the tare station T is continuously changed from that previously for the corresponding sector deducted gross value measured at the measuring station M and the resulting net value, ie the mass of the material conveyed in the corresponding sector, is made available for further evaluation, as described in detail in the aforementioned DE-C-32 17 406.
  • a setpoint for the material throughput can be created via line 231
  • the respective actual value can be displayed via a display 234
  • the speed of the motor 212 can be regulated via a control 232 in accordance with the deviation between the setpoint and actual value.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
  • Vending Machines For Individual Products (AREA)
  • Measuring Volume Flow (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Claims (14)

  1. Dispositif de dosage gravimétrique (10 ; 80 ; 120) de matériau en vrac, avec un rotor tournant autour d'un axe vertical, un poste de chargement (B) pour apporter du matériau au rotor, un poste de vidage (E) décalé par rapport au poste de chargement (B), et des dispositifs dynamométriques (20) avec lesquels on détermine la masse du matériau chaque fois transporté par le rotor sur une section de mesure (M) qui se trouve entre le poste de chargement (B) et le poste de vidage (E), caractérisé en ce que le rotor présente un disque de mesure (19) qui est divisé en au moins trois secteurs (18), de préférence de même grandeur, mobiles indépendamment les uns des autres au moins légèrement en direction verticale, et en ce que les dispositifs dynamométriques (20) sont disposés en dessous des secteurs (18) et déterminent la masse du matériau qui se trouve sur un secteur respectif (18) lors du défilement d'un secteur (18).
  2. Dispositif selon la revendication 1, caractérisé en ce qu'au moins quatre secteurs (18) sont prévus, et en ce qu'une section (T) de mesure du poids à vide du secteur, ou section de mesure de tare, est disposée entre le poste de vidage (E) et le poste de chargement (B), le poste de chargement (B), la section de mesure (M) (section de mesure du poids brut), le poste de vidage (E) et la section de mesure de tare (T) étant, en présence de quatre secteurs (18), respectivement décalés de 90°.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que sont prévus au poste de vidage (E), au-dessus du disque de mesure (19), un racleur (26) ou un dispositif d'aspiration (143, 144, 146) et éventuellement des moyens d'évacuation supplémentaires (44, 46 ; 60, 68).
  4. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le rotor présente un plateau tournant (16), qui est entraîné par un moteur (12) par l'intermédiaire d'un arbre (15) et sur lequel les différents secteurs (18) s'appuient par l'intermédiaire des dispositifs dynamométriques (20), l'appui des secteurs (18) sur les dispositifs dynamométriques (20 ; 55 ; 77 ; 79 ; 80 ; 82 ; 86 ; 91) pouvant s'effectuer environ à la manière d'un pont à bascule.
  5. Dispositif selon la revendication 1, 2 ou 3, caractérisé en ce qu'en présence de dispositifs dynamométriques (86) disposés stationnairement, le secteur respectif (18) qui défile au-dessus de ces dispositifs s'appuie sur eux, en vue de la détermination de la masse brute (et éventuellement de la tare), de préférence par l'intermédiaire de rouleaux (88).
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce que chaque secteur (18) ou, pour une formation de différence, deux secteurs respectifs (18) diamétralement opposés, est ou sont fixés à l'arbre (15) par l'intermédiaire d'un ensemble de bielles jumelées parallèles (84 ; 176).
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la mobilité verticale indépendante des secteurs (18) les uns par rapport aux autres est obtenue par une liaison élastique ou en forme de crochet (100 ; 107 ; 110) entre eux, ou bien le disque de mesure (19) et donc les secteurs (18) est ou sont recouverts par un tapis de caoutchouc ou par une tôle (100) à amincissements radiaux (110).
  8. Dispositif selon l'une des revendications précédentes, caractérisé par un carter (40) entourant le dispositif (10).
  9. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un sas à roue cellulaire (54) ou des dispositifs de déplacement (51, 52) sont disposés au poste de chargement (B) pour uniformiser l'apport de matériau.
  10. Dispositif selon l'une des revendications précédentes, caractérisé en ce que des dispositifs pneumatiques (44, 46 ; 66, 68) et/ou un sas à roue cellulaire (60) sont disposés au poste de vidage pour accélérer l'évacuation du matériau dosé.
  11. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce qu'un dispositif supplémentaire à plateau distributeur (70), qui est alimenté par un puits (74), est disposé au-dessus du disque de mesure (19) au poste de chargement (B) pour uniformiser l'apport de matériau.
  12. Procédé pour l'exploitation d'un dispositif selon l'une des revendications précédentes, caractérisé en ce qu'en reconnaissant en continu la position d'angle de rotation du disque de mesure rotatif (19), le ou les dispositifs dynamométriques (20 ; 55 ; 77 ; 79 ; 80 ; 82 ; 86 ; 91) est ou sont toujours activés pour une détermination de masse lorsqu'un secteur (18) se trouve dans la section de mesure (M).
  13. Procédé selon la revendication 12, caractérisé en ce qu'à la suite du vidage d'un secteur (18), on détermine la masse du secteur vide (18) et on la soustrait de la masse déterminée sur la section de mesure (M), c'est-à-dire avant le vidage du secteur (18), ou bien on entreprend seulement une formation de valeur moyenne de tare et on la prend en compte lors de la détermination de la masse, les masses ou masses différentielles chaque fois déterminées pouvant aussi être éventuellement accumulées.
  14. Procédé selon la revendication 12 ou 13, caractérisé en ce qu'on détermine en continu le débit de passage effectif et on s'en sert pour réguler la vitesse de rotation du disque de mesure et, le cas échéant du sas d'entrée et/ou du sas de sortie.
EP92115069A 1991-09-06 1992-09-03 Dispositif pour le dosage de matériaux en vrac Expired - Lifetime EP0530797B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4129618 1991-09-06
DE4129618A DE4129618A1 (de) 1991-09-06 1991-09-06 Gravimetrische dosiervorrichtung fuer schuettgueter

Publications (2)

Publication Number Publication Date
EP0530797A1 EP0530797A1 (fr) 1993-03-10
EP0530797B1 true EP0530797B1 (fr) 1994-12-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92115069A Expired - Lifetime EP0530797B1 (fr) 1991-09-06 1992-09-03 Dispositif pour le dosage de matériaux en vrac

Country Status (7)

Country Link
US (1) US5289724A (fr)
EP (1) EP0530797B1 (fr)
JP (1) JP3168356B2 (fr)
AT (1) ATE116432T1 (fr)
CA (1) CA2077507C (fr)
DE (2) DE4129618A1 (fr)
RU (1) RU2086930C1 (fr)

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Publication number Priority date Publication date Assignee Title
CN108896143A (zh) * 2018-06-14 2018-11-27 天地科技股份有限公司 一种旋转式三斗动态受料称量装置

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EP0615113B1 (fr) * 1993-03-10 1998-06-03 Pfister GmbH Dispositif pour le dosage de matériaux en vrac
DE4332062A1 (de) * 1993-09-21 1995-03-23 Pfister Gmbh Verfahren und Vorrichtung zum gravimetrischen Dosieren von Schüttgut
DE19504992C1 (de) * 1995-02-15 1996-03-14 Labschies Hartmut Vorrichtung zur Erzeugung eines kontinuierlichen Schüttgutstromes sowie die Ermittlung dessen Förderstärke bzw. Dosiermenge
DE19718567A1 (de) * 1997-05-03 1998-11-05 Pfister Gmbh Dosiervorrichtung
DE19751732A1 (de) * 1997-11-22 1999-05-27 Pfister Gmbh Gravimetrische Dosiervorrichtung für Schüttgüter
DE102004050709A1 (de) * 2004-10-17 2006-04-20 Pfister Gmbh Gravimetrische Dosiervorrichtung für Schüttgüter
DE102005018917A1 (de) * 2005-04-22 2006-11-02 Schenck Process Gmbh Schüttgutvorratsbehälter
US20090291403A1 (en) * 2008-05-23 2009-11-26 Giovann Conti Method and apparatus to deliver solid fuel to a combustion zone
US8371094B2 (en) * 2009-10-23 2013-02-12 Frito-Lay North America, Inc. Method and apparatus for compacting product
US9284075B2 (en) 2009-10-23 2016-03-15 Frito-Lay North America, Inc. Apparatus for compacting product and high speed bagmaking
US8656690B2 (en) * 2009-10-23 2014-02-25 Frito-Lay North America, Inc. Method and apparatus for compacting product
US8567165B2 (en) * 2009-10-23 2013-10-29 Frito-Lay North America, Inc. Method and apparatus for compacting product
DE102011081286A1 (de) * 2011-08-19 2013-02-21 Peter Rohn Behälter zur Vorbehandlung organischer Stoffe
CZ2014109A3 (cs) * 2014-02-20 2015-11-11 Assortis Electric, S.R.O. Zařízení pro vážení, dávkování a regulaci průtoku sypkých materiálů
CN113322747A (zh) * 2021-05-11 2021-08-31 扬州大学 多功能单复掺颗粒木质素和玄武岩纤维投料机及使用方法
JP2023049174A (ja) * 2021-09-29 2023-04-10 株式会社浪速製作所 粉粒体材料の計量・投入装置

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DE3217406C2 (de) * 1982-05-08 1986-06-05 Pfister Gmbh, 8900 Augsburg Vorrichtung zum kontinuierlichen gravimetrischen Dosieren von schüttfähigem Gut
DE3235039A1 (de) * 1982-09-22 1984-05-10 Pfister Gmbh, 8900 Augsburg Vorrichtung zum kontinuierlichen gravimetrischen dosieren und pneumatischen foerdern von schuettfaehigem gut
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108896143A (zh) * 2018-06-14 2018-11-27 天地科技股份有限公司 一种旋转式三斗动态受料称量装置

Also Published As

Publication number Publication date
CA2077507C (fr) 2002-08-27
RU2086930C1 (ru) 1997-08-10
JP3168356B2 (ja) 2001-05-21
ATE116432T1 (de) 1995-01-15
JPH05203480A (ja) 1993-08-10
CA2077507A1 (fr) 1993-03-07
EP0530797A1 (fr) 1993-03-10
DE4129618A1 (de) 1993-03-11
US5289724A (en) 1994-03-01
DE59201086D1 (de) 1995-02-09

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